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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59bde11204e117a09b5f98a120edabe3c9004aed56165999a87f35c3e513a8bb' 
  AND token = '6znHpwOTfb6JYWvuAyVnajvNW8j/6NrSNXvqArRdS08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}